RadCartesianChartView need an axis that can represent the values of the data points. The base class for the axes that can represent value is NumericalAxis.
It is an abstract class which extends the base CartesianAxis class and is used to represent the value of a data point.

The LinearAxis extends the base CartesianAxis class and plots the associated data points using each point's actual value, provided for the axis. The axis works with categorical data and uses the Value property of each CategoricalDataPoint that needs to be plotted. It will build a numerical range (user-defined or automatically calculated) and will determine each data point X or Y coordinate (depending on whether the axis is specified as Horizontal or as Vertical).

The Major Step specifies the step at which the major ticks are positioned on the axis. If this property is set to 0 (by default), the axis automatically calculates the step so that the data will be visualized in the best possible way. For example, if you want to set the distance between the ticks to a fixed value like 10, you can use the method setMajorStep(double):